package cn.com.shopec.erp.common.utils;

import java.security.MessageDigest;

/**
 * MD5工具类
 * @ClassName MD5Util
 * @Description TODO
 * @author chengui
 * @date 2012-11-6 下午1:59:14
 */
public class MD5Util {
	
	private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
		"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
	
	private static String byteArrayToHexString(byte b[]) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++)
			resultSb.append(byteToHexString(b[i]));

		return resultSb.toString();
	}

	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0)
			n += 256;
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}

	public static String MD5Encode(String origin, String charsetname) {
		String resultString = null;
		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			if (charsetname == null || "".equals(charsetname)){
				resultString = byteArrayToHexString(md.digest(resultString
						.getBytes()));
			}
			else {
				resultString = byteArrayToHexString(md.digest(resultString
						.getBytes(charsetname)));
			}

		} catch (Exception exception) {
		}
		return resultString;
	}
	
	public static void main(String[] args) {
		System.out.println(MD5Util.MD5Encode("123456", "").toUpperCase());
	}
}
